Bag for use in gas can

ABSTRACT

A gas-containing apparatus includes a can, a bag and a cover. The bag is installed in the can. The bag includes a tube formed thereon and with an internal side and an external side, a thread formed on the external side of the tube and a boss formed on the external side of the tube. The cover is mounted on the can. The cover includes a valve with an external side and an internal side, a thread formed on the internal side of the valve for engagement with the thread of the bag and a recess defined in the valve for receiving the boss, thus avoiding rotation of the tube relative to the valve.

BACKGROUND OF INVENTION

[0001] 1. Field of Invention

[0002] The present invention relates to a bag for use in a gas can.

[0003] 2. Related Prior Art

[0004] Referring to FIG. 5, a conventional valve 2 of a gas can. Thevalve 2 includes a hole 3 defined therein and an annular flange 4 formedon the wall of the hole 3. A bag 5 includes a nozzle 6 on which anannular flange 7 is formed. The bag 5 is put in the gas can. The nozzle6 is inserted in the hole 3. The annular flange 7 is engaged with theannular flange 4. However, this engagement is not firm. The annularflange 7 can be disengaged from the annular flange 4 when the pressurein the bag 5 is high.

[0005] The present invention is therefore intended to obviate or atleast alleviate the problems encountered in prior art.

SUMMARY OF INVENTION

[0006] It is the primary objective of the present invention to provide asecure gas-containing apparatus.

[0007] According to the present invention, a gas-containing apparatusincludes a can, a bag and a cover. The bag is installed in the can. Thebag includes a tube formed thereon and with an internal side and anexternal side, a thread formed on the external side of the tube and aboss formed on the external side of the tube. The cover is mounted onthe can. The cover includes a valve with an external side and aninternal side, a thread formed on the internal side of the valve forengagement with the thread of the bag and a recess defined in the valvefor receiving the boss, thus avoiding rotation of the tube relative tothe valve.

[0008] Other objects, advantages, and novel features of the inventionwill become more apparent from the following detailed description whentaken in conjunction with the attached drawings.

BRIEF DESCRIPTION OF DRAWINGS

[0009] The present invention will be described through detailedillustration of embodiments referring to the attached drawings wherein:

[0010]FIG. 1 is a perspective view of a gas-containing apparatusaccording to the preferred embodiment of the present invention.

[0011]FIG. 2 is an exploded view of the gas-containing apparatus shownin FIG. 1.

[0012]FIG. 3 is a partial cutaway of the gas-containing apparatus shownin FIG. 1.

[0013]FIG. 4 is a cross-sectional view of the gas-containing apparatusshown in FIG. 1.

[0014]FIG. 5 is a partial cutaway of a conventional gas-containingapparatus.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

[0015]FIG. 1 shows a gas-containing apparatus 1 according to thepreferred embodiment of the present invention. The gas-containingapparatus 1 includes a can 10 and a cover 20 mounted on the can 10.

[0016] Referring to FIG. 2, the can 10 defines a space 11 for containinggas and includes an upper rim 12.

[0017] The cover 20 includes a rim 21 engaged with the upper rim 12 ofthe can 10. For adequate sealing, a seal 22 is often sandwiched betweenthe rim 21 of the cover 20 and the upper rim 12 of the can 10. A valve23 is mounted on the cover 20. The valve 23 is a tubular element with anexternal side and an internal side. A thread 24 is formed on theinternal side of the valve 23. The valve 23 defines a recess 25 at alower end thereof.

[0018] A bag 30 filled with gas is installed in the can 10. The bag 30includes a tube 31 formed thereon and with an internal side and anexternal side. On the external side of the tube 31 is formed a thread 32for engagement with the thread 24. Also on the external side of the tube31 is formed a boss 33 for insertion in the recess 25 as clearly shownin FIGS. 3 and 4, thus avoiding rotation of the tube 31 relative to thevalve 23. The boss 33 includes an inclined side 34 for facilitating theboss 33 entering the recess 25 in a direction and an upright side 35 foravoiding the boss 33 escaping the recess 25 in an opposite direction.Thus, the engagement of the tube 31 with the valve 23 is firm.

[0019] The present invention has been described through detailedillustration of the preferred embodiment. Those skilled in the art canderive variations from the preferred embodiment without departing fromthe scope of the present invention. Therefore, the preferred embodimentshall not limit the scope of the present invention defined in theclaims.

What is claimed is:
 1. A gas-containing apparatus includes: a can; a baginstalled in the can, the bag including a tube formed thereon and withan internal side and an external side, a thread formed on the externalside of the tube and a boss formed on the external side of the tube; anda cover mounted on the can, the cover including a valve with an externalside and an internal side, a thread formed on the internal side of thevalve for engagement with the thread of the bag and a recess defined inthe valve for receiving the boss, thus avoiding rotation of the tuberelative to the valve.
 2. The gas-containing apparatus according toclaim 1 wherein the boss includes an inclined side for facilitating theboss entering the recess in a direction and an upright side for avoidingthe boss escaping the recess in an opposite direction.
 3. Thegas-containing apparatus according to claim 1 wherein the can includesan upper rim, and the cover includes a rim for engagement with the upperrim of the can.
 4. The gas-containing apparatus according to claim 3including a seal installed between the upper rim of the can and the rimof the cover.
 5. A gas-containing apparatus includes: a can; a baginstalled in the can, the bag including a tube formed thereon and withan internal side and an external side, a thread formed on the externalside of the tube and a recess defined in the tube; and a cover mountedon the can, the cover including a valve with an external side and aninternal side, a thread formed on the internal side of the valve forengagement with the thread of the bag and a boss formed on the valve forinsertion in the recess, thus avoiding rotation of the tube relative tothe valve.
 6. The gas-containing apparatus according to claim 5 whereinthe boss includes an inclined side for facilitating the boss enteringthe recess in a direction and an upright side for avoiding the bossescaping the recess in an opposite direction.
 7. The gas-containingapparatus according to claim 5 wherein the can includes an upper rim,and the cover includes a rim for engagement with the upper rim of thecan.
 8. The gas-containing apparatus according to claim 7 including aseal installed between the upper rim of the can and the rim of thecover.